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Divestitures and Other Transactions Divestitures and Other Transactions - Divested Ag Business Results of Operations (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Goodwill impairment charge | $ 0 |  |  | $ 1,102 |
(Loss) income from discontinued operations after income taxes |  | $ 1,077 | $ (323) | 717 | $ (674)
Specialty Products Disposal [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Goodwill impairment charge |  | 1,102 | 0 | 1,102 | 0
(Loss) income from discontinued operations before income taxes |  | (1,237) | 535 | (798) | 1,002
(Loss) income from discontinued operations after income taxes |  | 1,243 | $ (267) | 902 | (559)
Equity Method Investment, Other than Temporary Impairment |  | 63 |  | 63 |
Divested Ag Business [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
(Loss) income from discontinued operations before income taxes |  |  |  |  | (10)
(Loss) income from discontinued operations after income taxes |  | 80 |  | 80 | $ 5
Other discontinued operations [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
(Loss) income from discontinued operations after income taxes |  | 86 |  | 86 |
Industrial Biosciences [Member] | Specialty Products Disposal [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Goodwill impairment charge |  | $ 1,102 |  | $ 1,102 |

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